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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2162d03230ed29b0aa64aeafb07f2c4cd2e7e53c12fd4823dc5c47b3f315282c' 
  AND token = '1do2fR96JqHggHf1rUbF5C84KWFEemvVy7Z44fhiJNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}